/**
 * Copyright 2011 Honeywell Federal Manufacturing & Technologies, LLC. This material was produced under U.S. Government
 * contract DE-ACO4-01AL66850, Honeywell Federal Manufacturing & Technologies, LLC, (FM&T) with the U. S. Department of
 * Energy for the operation of the Kansas City Plant . The U.S. Government has rights to use, reproduce, and distribute
 * this software.  NEITHER THE GOVERNMENT NOR Honeywell Federal Manufacturing & Technologies, LLC, MAKES ANY WARRANTY,
 * EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE.  If software is modified to produce
 * derivative works, such modified software should be clearly marked, so as not to confuse it with the version available
 * from FM&T.
 *
 * Additionally, this program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License Version 3 published by the Free Software Foundation. Accordingly, this program is distributed in
 * the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this library.
 * If not, see http://www.gnu.org/licenses/.
 */
package org.braintrain.services;

import com.kcp.ko.fmtnmlib.service.dao.HibernatePersistenceDAO;
import com.kcp.ko.fmtnmlib.tools.defensive.Defensive;
import org.apache.log4j.Logger;
import org.braintrain.domain.BlobFile;
import org.braintrain.domain.ResourceFacade;
import org.hibernate.Hibernate;
import org.springframework.beans.factory.annotation.Required;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;

/**
 * Blob based Implementation of Resource Manager
 *
 * @author John Ericksen
 */
public class BlobResourceManagerImpl implements ResourceManager{

    private static final Logger LOG = Logger.getLogger(BlobResourceManagerImpl.class);
    private HibernatePersistenceDAO dao;

    /**
     * Saves the provided input stream value tot he given resource.
     *
     * @param input
     * @param resourceFacade
     */
    public void saveResourceValue(InputStream input, ResourceFacade resourceFacade) {
        Defensive.notNull(resourceFacade, "Resource Facade");

        if (input != null)
        {
            try {
                Blob blob = Hibernate.createBlob(input);
                
                BlobFile blobFile = new BlobFile();
                blobFile.setData(blob);

                resourceFacade.setBlobFile(blobFile);

                dao.save(resourceFacade);

            } catch (IOException e) {
                LOG.error(e);
            }
        }
    }

    public InputStream getStream(ResourceFacade resource) throws Exception {
        return resource.getBlobFile().getData().getBinaryStream();
    }

    public boolean isEmpty(ResourceFacade resource) {
        return resource == null || resource.getBlobFile() == null || resource.getBlobFile().getData() == null;
    }

    @Required
    public void setDao(HibernatePersistenceDAO dao) {
        this.dao = dao;
    }
}
